基于阶梯模型的摆动焊接温度场数值模拟

根据摆动焊接速度和方向的变化规律,建立了电弧摆动焊接适用范围更加广泛的阶梯模型,以Q345平板对接接头为研究对象,利用焊接模拟软件SYSWELD对摆动焊接过程的温度场进行数值模拟,获得了焊缝区瞬态温度场以及各节点的焊接热循环曲线.结果表明,电弧摆动阶梯模型的瞬态温度场形状与带状热源模型不同,当热源由中间向两边摆动时,阶梯模型的熔池呈头小尾大的椭圆形;电弧摆动阶梯模型的焊接热循环曲线也与带状热源模型不同,阶梯模型的焊接热循环曲线在加热和冷却过程中都会出现一个小波峰,表明焊缝在加热和冷却过程受到电弧摆动的影响.

Numerical simulation of temperature field in weaving welding based on ladder model

According to the characteristic of weaving welding, an arc swing ladder model was established on basis of strip heat source and numerical simulation of temperature field inQ345 steel plate butt joint with weaving welding was done using commercial software SYSWELD. The transient temperature field and thermal cycle curves in the welded zone were obtained. The results showed that the transient temperature field with arc-weaving ladder model was different from that with strip heat source model, and the weld pool with ladder model was elliptical with small head and big rump when the heat source moved from the middle to both sides. The thermal cycle curves with ladder model were also different from those with strip heat source model, and they had a wave crest both in heating and cooling, which reflected that the weld was affected by the arc weaving upon heating and cooling.